No special limitation of velocity, structural trend and dip is needed in the technique.
该方法对速度和构造走向及倾角都无特殊限制。
This strike will generally follow the structural trend of the crystalline rocks in the area.
这种走向通常与当地的结晶岩走向一致。
But there are also structural reasons for the trend.
但这种趋势也有结构性的原因。
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